Common Equity (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended	12 Months Ended
	Oct. 31, 2010	Dec. 31, 2014 plan	Dec. 31, 2013	Dec. 31, 2012
Number of equity ownership plans		2
Authorization of repurchase of common stock	$ 500	$ 350
Common Stock, Dividends, Per Share, Declared		$ 3.32	$ 3.32	$ 3.32
Dividend payments received from subsidiaries		893	702	439
Entergy Arkansas [Member]
Restricted retained earnings unavailable for distribution		394.9
Entergy Mississippi [Member]
Restricted retained earnings unavailable for distribution		$ 68.5